Improvement in machines for forming spiral washers



S. TRETHEWEY, Machine for Forming Spiral Washers. No. 159,232 Patentedlan.26,l875.,

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UNITED STATES PATENT Orrron.

SAMUEL TRETHEWEY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO METOALF, PAUL & 00., OF SAME-PLACE.

IMPROVEMENT IN MACHINES FOR FORMING SPIRAL WASHERS.

Specification forming part of Letters Patent No. 1 59,232, dated January 26, 1875; application filed December 8, 1874.

To all whom it may concern Be it known that I, SAMUEL TRETHEWEY, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful-Improvement in Devices for Bending and Setting Nut-Locks, 850.; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, forming a part of this specification, in which Figure l is an elevation of my improved machine, the bed being in section. Fig. 2 is a sectional view, showing the discharging- I trigger. Fig. 3 is a view of one of the hollow griping-dies, and Fig. 4 is a nut-lock.

Like letters refer to like parts in the several figures.

My invention relates to machinery for bending and setting nut-locks for fish-bars and similar uses; and it consists in hollow gripedies having inclined faces inserted in the ends of mandrels,through one of which asolid mandrel reciprocates, so that the central solid mandrel supports the washer while griped by the dies, and the revolution of the hollow mandrel withraws the central mandrel at the instant the washer is released by the gripingdies. The discharge of the washer from the dies may be facilitated by the stroke of a'trigger operated by a cam upon the gear-wheel carrying the hollow mandrel.

In the drawing referred to, A indicates a shaft carrying the two small pinions a a, meshing into gear-wheels B B, which carry the hollow mandrels O 0 The hollow mandrel 0 passes loosely through the center of gearwheel B, so as to have an end movement, but is secured to the wheel B by a groove and feather, so as to revolve with the wheel. Theforward movement or advance of the hollow mandrel and its hollow griping-die is caused by a cam, D on the end of the mandrel, and its quick return movement by a spiral spring, A surrounding the mandrel. In the end of hollow mandrel G is secured a hollow griping-die, 0 having an inclined face, 0, shown more clearly in Fig. 3. G is a second hollow mandrel, similar in construction to the mandrel O, in so far as it is supplied with a hollow griping-die, 0 having an inclined face, but this mandrel is keyed to the gear-wheel B, so that its only movement is that of revolution with the gear-wheel. (Jentrally of the hollow mandrel O is a solid mandrel, D, keyed to and revolving with the 1101- low mandrel 0 the key 0 working in an elongated slot in the mandrel so as to allow the withdrawal of mandrell) by a cam, D, at the instant that the griping-dies 0 separate to release the washer. The quick return movement of mandrel D is caused bya spiral spring, A, or equivalent mechanism. Directly over the bite of the gripingdies is a post, 01, through which works a trigger, e. To the post is pivoted a lever, cl, operated by a cam or cams upon the gear-wheel B. The cam upon the gear-wheel is so located as to operate the lever (1 and trigger c at the instant that the washer is released by the griping-dies, so as to .cause the trigger to strike the washer and and facilitate its discharge from the machine. The trigger, being quickly retracted by a spiral spring, 6, does not interfere with the revolution of the mandrels. The dies, at the point of meeting, are surrounded by a bridge, through one wall of which is a feed channel or opening for the introduction of the blank.

The essentials of this machine are the hollow griping-dies having inclined faces, and the reciprocating mandrel.

The operation of these devices is as follows: The blank, previously heated, is introduced through the feed channel or opening in the bridge until it comes within the gripe of the dies, which advance and seize it, drawingit from the feed-channel, the bridge preventing it from revolving with the dies, bending it around the mandrel D, and at the same time, owing to the inclined faces of the dies, setting it to the form shown in Fig. 4. When the dies have made one complete revolution the mandrel D is withdrawn by the cam D, and the mandrel G retracted by the spiral spring A or other suitable device, and simultaneously the cam on the face of gear-wheel B comes in contact with lever d, forcing down the trigger 0, cansing it to strike the washer sharply and thus facilitate its escape from the machine. The discharge of the washer will generally occur from its own weight, butis insured by a blow from a trigger similar to that shown in the die, substantially as and for the purpose specidrawing. fied.

Having thus described my invention, what In testimony whereof I, the said SAMUEL I claim, and desire to secure by Letters Pat- TRETI-IEWEY, have hereunto set my hand.

ent is 'Jlhe combination of the hollow griping-dies SAMUEL TRETHEWEY' having inclined faces, the reciprocating cen- Witnesses: tral mandrel, and suitable mechanism for pre- J. W. PAUL,

venting the blank from revolving with the D. S. WILLIAMS. 

